Journal
FUEL
Volume 325, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.124819
Keywords
Complete confinement; Sintering resistance; Ce/Ni bimetallic catalyst; Oxygen vacancy; Dry reforming of methane
Categories
Funding
- National Natural Science Foundation of China [22168013, 22068009, 22062003]
- Guizhou Provincial Science and Technology Projects [ZK [2022] 074, [2019] 2872, [2020] 1Y037]
- Natural Science Foundation of Guizhou University [GDTGHZ (201905)]
- Guizhou University [[2020] 31]
- National Foreign Expert Project [G2021038005L]
- Innovation Group Project of Education Department in Guizhou Province [2021010]
- One Hundred Person Project of Guizhou Province [20165655]
- Green Energy Program [WBS: A-0005323-05-00]
- FRC MOE T1 [WBS: A-0009184-00-00]
- A*STARLCERFI Project [U2102d2011]
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CO2 reforming of methane using inexpensive and active Ni-based catalysts is a promising process to convert greenhouse gases to value-added syngas. However, sintering and carbon deposition remain major challenges. This study synthesized bimetallic Ce/Ni nanoparticles confined within SiO2 nanotubes, which exhibited higher activity and stability in the DRM reaction. The preparation method provides insights for designing other confined bimetallic catalysts with high sintering resistance for high temperature reactions.
CO2 reforming of methane (DRM) is currently one of the most promising processes to convert two green-house gases: CH4 and CO2 to value-added syngas, boosting CO2 utilization and promoting carbon neutralization. However, a major challenge of inexpensive and active Ni-based catalysts for DRM reactions is their easy sintering and carbon deposition issues. Herein, a series of bimetallic Ce/Ni nanoparticles completely confined within SiO2 nanotube (NT) catalysts were synthesized by the precipitation and coating method. Compared with Ni@SiO2, bimetallic xCe/Ni@SiO2 catalysts have higher specific activities for DRM reaction. In addition, 20Ce/Ni@SiO2 shows high and stable CH4 and CO2 conversions of 76.3% and 80.1%, respectively at 700 ? for 80 h. High Ni sintering resistance, high concentration of surface Ni and oxygen vacancies (V-o), high carbon resistance contribute to its outstanding DRM performance. The CO2 activation mechanisms via CeO2 and H* was revealed via in-situ DRIFTS study. The preparation method to completely confine bimetallic nanoparticles within SiO2 NTs sheds light on the design of other confined bi/tri-metallic catalysts with high sintering resistance to be applied in other high temperature reactions.
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